JPS6296808U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例を示す回路図、第２
図は同上回路のリニアソレノイド端子電圧Ｖ_１と
駆動電流Ｉ_０の特性を示すタイムチヤート、第３
図は従来例を示す回路図、第４図は同上回路のリ
ニアソレノイドの電気―機械変換特性を示す線図
、第５図は同上リニアソレノイドの好適な駆動電
流波形図、第６図は同上リニアソレノイドの端子
電圧Ｖ_０と駆動電流Ｉ_０の特性を示すタイムチヤ
ートである。 ＶＢ…電源、Ｌ…リニアソレノイド、Ｑ_２…ト
ランジスタ、ＲＳ…電流検出用抵抗、Ｆ…フイー
ドバツク回路、Ｔ_０…トランジスタ駆動回路、Ｏ
ＳＣ…発振回路、Ｄ…ダイオード、ＺＤ…ツエナ
ダイオード。 Figure 1 is a circuit diagram showing one embodiment of the present invention;
The figure is a time chart showing the characteristics of the linear solenoid terminal voltage V ₁ and drive current I ₀ of the same circuit.
The figure is a circuit diagram showing a conventional example, Figure 4 is a line diagram showing the electrical-mechanical conversion characteristics of the linear solenoid in the above circuit, Figure 5 is a suitable drive current waveform diagram for the same linear solenoid, and Figure 6 is a diagram showing the linear solenoid in the same circuit. This is a time chart showing the characteristics of the terminal voltage V ₀ and drive current I ₀ of the solenoid. VB...power supply, L...linear solenoid, _Q2 ...transistor, RS...current detection resistor, F...feedback circuit, _T0 ...transistor drive circuit, O
SC...Oscillation circuit, D...Diode, ZD...Zena diode.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 電源とソレノイドとの間にソレノイドの駆動電
流を制御するトランジスタと、ソレノイドに流れ
る電流を検出する電流検出用抵抗とを直列に接続
し、電流検出用抵抗の端子電圧を増幅して出力す
るフイードバツク回路と、指令電圧に交流電圧を
重畳した入力電圧と前記フイードバツク回路から
出力されるフイードバツク電圧とを比較して、ソ
レノイドに入力電圧に対応する電流を供給するよ
うに前記トランジスタを駆動するトランジスタ駆
動回路とを備えてなるソレノイド駆動回路におい
て、電流検出用抵抗をソレノイド駆動用のトラン
ジスタとソレノイドとの間に接続すると共に、前
記交流電圧の下降時にソレノイドに生じる逆起電
圧によりソレノイドとの間に電流を流す方向に設
けられるダイオードと、該ダイオードと直列に接
続され、前記逆起電圧が所定値以上の時に導通す
るツエナダイオードとをソレノイドと並列に接続
したことを特徴とするソレノイド駆動回路。 A feedback circuit that connects a transistor that controls the drive current of the solenoid and a current detection resistor that detects the current flowing through the solenoid in series between the power supply and the solenoid, and amplifies and outputs the terminal voltage of the current detection resistor. and a transistor drive circuit that compares an input voltage obtained by superimposing an AC voltage on a command voltage with a feedback voltage output from the feedback circuit, and drives the transistor so as to supply a current corresponding to the input voltage to the solenoid. In the solenoid drive circuit, a current detection resistor is connected between the solenoid drive transistor and the solenoid, and a current is caused to flow between the solenoid and the solenoid by a back electromotive force generated in the solenoid when the AC voltage falls. 1. A solenoid drive circuit comprising: a diode provided in the direction of the solenoid; and a Zener diode connected in series with the diode and conductive when the back electromotive force is equal to or higher than a predetermined value, and connected in parallel with the solenoid.